This is the HKS Circle Earth System. https://www.hks-power.co.jp/product/electronics/ignittion/circleearth/index.html Six wires are included. (See photos) It was installed on a car I purchased used, and I removed it when selling the car and stored it indoors for about 10 years. Everything in the photos is included. The terminal for connecting to the battery is missing. This product is expected to improve performance by changing the earth cable. Please check the official page for details. I am also selling other grounding-related items, so if you would like to purchase multiple items, please leave a comment and I will respond. Thank you. (*_ _)